Trivex Lenses are another kind of lightweight materials designed slightly different from polycarbonate and their visual acuity is better than polycarbonate. With the strength and impact resistance of Trivex Lenses, they are great choices for those patients who want a semi-rimless or drill mount frame. Like polycarbonate, Trivex Lenses can block 100% of the sun's UV rays. Semi-finished or finished are available.